RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Variable Interest Entity [Line Items]
Net interest income	$ 4,569,910	$ 4,827,921	$ 7,687,482	$ 10,611,682
General and administrative fees	(962,284)	(1,243,257)	(2,352,345)	(2,831,829)
Unrealized gain (loss) on residential loans held in securitization trusts	5,905,602	(250,079)	5,650,199	(618,422)
Net income (loss)	(21,490,063)	(2,296,571)	(10,175,063)	72,570
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income	954,711	1,298,520	2,102,352	2,653,958
Interest expense	765,914	1,030,971	1,685,971	2,105,323
Net interest income	188,797	267,549	416,381	548,635
General and administrative fees	(13,958)	(11,380)	(20,886)	(23,224)
Unrealized gain (loss) on residential loans held in securitization trusts	5,905,602	(250,079)	5,650,199	(618,422)
Net income (loss)	$ 6,080,441	$ 6,090	$ 6,045,694	$ (93,011)